OSV-2020-789 Heap-use-after-free in llvm_ks::X86Operand::getToken

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22850 Crash type: Heap-use-after-free READ 4 Crash state: llvmks::X86Operand::getToken X86AsmParser::MatchAndEmitATTInstruction X86AsmParser::MatchAndEmitInstruction...